Leumann André, Valderrabano Victor, Hoechel Sebastian, Göpfert Beat, Müller-Gerbl Magdalena
Institute of Anatomy, University of Basel, Basel, Switzerland; Orthopaedic Department, University Hospital of Basel, Basel, Switzerland.
Orthopaedic Department, University Hospital of Basel, Basel, Switzerland.
J Foot Ankle Surg. 2015 Jan-Feb;54(1):17-22. doi: 10.1053/j.jfas.2014.09.035. Epub 2014 Nov 15.
The subchondral bone plate plays an important role in stabilizing the osteochondral joint unit and in the pathomechanism of osteochondral lesions and osteoarthritis. The objective of the present study was to measure the mineral density distribution and subchondral bone plate penetration strength of the talar dome joint facet to display and compare the specific distribution patterns. Ten cadaver specimens were used for computed tomography (CT) scans, from which densitograms were derived using CT-osteoabsorptiometry, and for mechanical indentation testing from which the penetration strength was obtained. Our results showed 2 different distribution patterns for mineral density and penetration strength. Of the 10 specimens, 6 (60%) showed bicentric maxima (anteromedially and anterolaterally), and 4 (40%) showed a monocentric maximum (either anteromedially or anterolaterally). A highly significant correlation (p < .0001) for both methods confirmed that the mineral density relied on local load characteristics. In conclusion, the biomechanical properties of the subchondral bone plate of the talar dome joint facet showed specific distribution patterns. CT-osteoabsorptiometry is a reliable method to display the mineral density distribution noninvasively. We recommend CT-osteoabsorptiometry for noninvasive analysis of the biomechanical properties of the subchondral bone plate in osteochondral joint reconstruction and the prevention and treatment of osteoarthritis and osteochondral lesions.
软骨下骨板在稳定骨软骨关节单元以及在骨软骨损伤和骨关节炎的发病机制中发挥着重要作用。本研究的目的是测量距骨穹窿关节面的矿物质密度分布和软骨下骨板穿透强度，以展示和比较特定的分布模式。使用10个尸体标本进行计算机断层扫描（CT），通过CT骨密度测定法得出骨密度图，并进行机械压痕测试以获得穿透强度。我们的结果显示了矿物质密度和穿透强度的2种不同分布模式。在10个标本中，6个（60%）显示双中心最大值（前内侧和前外侧），4个（40%）显示单中心最大值（前内侧或前外侧）。两种方法之间的高度显著相关性（p <.0001）证实了矿物质密度依赖于局部负荷特征。总之，距骨穹窿关节面软骨下骨板的生物力学特性显示出特定的分布模式。CT骨密度测定法是一种可靠的无创显示矿物质密度分布的方法。我们推荐使用CT骨密度测定法对骨软骨关节重建以及骨关节炎和骨软骨损伤的预防和治疗中的软骨下骨板生物力学特性进行无创分析。
